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  Map creation device and navigation deviceUSPTO Application #: 20070200845Title: Map creation device and navigation device Abstract: In a map creation device (100), a simple-three-dimensional-ground-information creating unit (104) creates, using a three-dimensional ground object indicating a three-dimensional shape of a ground, a simple-three-dimensional ground object having less amount of data than the three-dimensional ground object. A three-dimensional-on-ground-structure-information creating unit (105) adds, using the simple-three-dimensional ground object created, height information to a two-dimensional on-ground-structure object indicating a two-dimensional shape of an on-ground structure present on a surface of the ground. Then, a three-dimensional on-ground-structure object indicating a three-dimensional shape of the on-ground structure is created. A three-dimensional-map-information creating unit (106) creates three-dimensional map information based on the three-dimensional ground object and the three-dimensional on-ground-structure object. (end of abstract) Agent: Young & Thompson - Arlington, VA, US Inventors: Shunichi Kumagai, Hajime Adachi, Reiji Matsumoto, Takuya Hirose, Masayoshi Suzuki USPTO Applicaton #: 20070200845 - Class: 345419000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070200845. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a map creation device, a navigation device, a map creation method, a map creation program, and a recording medium. BACKGROUND ART [0002] Conventionally, a vehicle navigation device with which a map can be displayed in three dimensions has been proposed. In the vehicle navigation device, a map detecting device reads out, from a map memory device, map data of an area around a current position of a vehicle calculated by a position calculating device or map data corresponding to a range of map designated by an input device. An arithmetic processing device performs perspective transformation of four vertices of the read-out map data, base on coordinates of the point of view and the point of gaze, mapping of the map data into the transformed coordinates, and clipping. Then, the arithmetic processing device causes an output device to display the map on which the mapping has been performed (refer to, for example, Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open Publication No. H9-138136 DISCLOSURE OF INVENTION Problem to be Solved by the Invention [0004] However, in the vehicle navigation device according to Patent Document 1 described above, a road is expressed with link data regardless of width of the road to be pasted on a polygon plane of three-dimensional ground information as a texture. Therefore, it is impossible to realistically express a road having a width corresponding to a real geographical feature on the three-dimensional ground information. [0005] On the other hand, if an object along a ground level such as a road object having a width corresponding to a real geographical feature is described on a three-dimensional ground object, all polygon planes in the three-dimensional ground object have to be taken into consideration, thereby causing enormous amount of calculation. Therefore, installation of a high performance CPU is necessary, resulting in increases in cost of the navigation device. Means for Solving Problem [0006] A map creation device according to the invention of claim 1 includes a three-dimensional-ground-information memory unit that stores three-dimensional ground information indicating a three-dimensional shape of a ground; a simple-three-dimensional-ground-information creating unit that creates simple-three-dimensional ground information having less amount of data than the three-dimensional ground information, using the three-dimensional ground information stored by the three-dimensional-ground-information memory unit; a three-dimensional-on-ground-structure-information creating unit that creates, by adding height information to two-dimensional on-ground-structure information indicating a two-dimensional shape of an on-ground structure that is present on a surface of the ground, three-dimensional on-ground-structure information indicating a three-dimensional shape of the on-ground structure, using the simple-three-dimensional ground information created by the simple-three-dimensional-ground-information creating unit; and a three-dimensional-map-information creating unit that creates three-dimensional map information, based on the three-dimensional ground information stored by the three-dimensional-ground-information memory unit and the three-dimensional on-ground-structure information created by the three-dimensional-on-ground-structure creating unit. [0007] A navigation device according to the invention of claim 10 includes a three-dimensional-ground-information memory unit that stores three-dimensional ground information indicating a three-dimensional shape of a ground; a point-information input unit that receives an input of point information indicating an arbitrary point; a three-dimensional-ground-information extracting unit that extracts, from the three-dimensional ground information stored by the three-dimensional-ground-information memory unit, three-dimensional ground information indicating a three-dimensional shape of a ground within a predetermined range including the point information input by the point-information input unit; a simple-three-dimensional-ground-information creating unit that creates, using the three-dimensional ground information extracted by the three-dimensional-ground-information extracting unit, simple-three-dimensional ground information having less amount of data than the three-dimensional ground information; a three-dimensional-on-ground-structure information creating unit that creates, by adding height information to two-dimensional on-ground-structure information indicating a two-dimensional shape of an on-ground structure present on a surface of the ground within the range including the point information using the simple-three-dimensional ground information created by the simple-three-dimensional-ground-information creating unit, three-dimensional on-ground-structure information indicating a three-dimensional shape of the on-ground structure; a three-dimensional-map-information creating unit that creates three-dimensional map information, based on the three-dimensional ground information extracted by the three-dimensional-ground-information extracting unit and the three-dimensional on-ground-structure information created by the three-dimensional-on-ground-structure-information creating unit; a map display information creating unit that creates, using the three-dimensional map information, map display information viewed from a view position corresponding to a position of the point information; a display unit that includes a display; and a display-control unit that controls the display and displays a map screen using the map display information created by the map display information creating unit. [0008] A map creation method according to the invention of claim 12 includes a three-dimensional-ground-information inputting step of imputing three-dimensional ground information indicating a three-dimensional shape of a ground; a simple-three-dimensional-ground-information creating step of creating, using the three-dimensional ground information input at the three-dimensional-ground-information-inputting step, simple-three-dimensional ground information having less amount of data than the three-dimensional ground information; a three-dimensional-on-ground-structure-information-creating step of creating, by adding height information to two-dimensional on-ground-structure information indicating a two-dimensional shape of an on-ground structure present on a surface of the ground within the range including the point information using the simple-three-dimensional ground information created at the simple-three-dimensional-ground-information-creating step, three-dimensional on-ground-structure information indicating a three-dimensional shape of the on-ground structure; and a three-dimensional-map-information-creating step of creating three-dimensional map information, based on the three-dimensional ground information input at the three-dimensional-ground-information inputting step and the three-dimensional on-ground-structure information created at the three-dimensional-on-ground-structure-information creating step. [0009] A map creation program according to the invention of claim 13 causes a computer to execute the map creation method. [0010] A computer-readable recording medium according to the invention of claim 14 stores the program according to claim 13. BRIEF DESCRIPTION OF DRAWINGS [0011] FIG. 1 is a block diagram of a functional configuration of a map creation device according to a first embodiment; [0012] FIG. 2 is an explanatory view for illustrating an example of a three-dimensional ground object; [0013] FIG. 3 is an explanatory view for illustrating an example of a two-dimensional on-ground-structure object; [0014] FIG. 4 is an explanatory view of road-link data; [0015] FIG. 5 is an explanatory view of a three-dimensional ground object present on two-dimensional rectangular information corresponding to a creation range; [0016] FIG. 6 is an explanatory view for illustrating a state of the two-dimensional rectangle information before and after transformation; [0017] FIG. 7 is an explanatory view of split-three-dimensional rectangle information shown in FIG. 6; [0018] FIG. 8 is an explanatory view of an example of creating two-dimensional on-ground-structure using two-dimensional shape information; Continue reading... Full patent description for Map creation device and navigation device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Map creation device and navigation device patent application. Patent Applications in related categories: 20080106546 - Method and device for generating 3d images - A method for generating three-dimensional images based on a sequence of two-dimensional images is characterized by the steps of: analyzing a two-dimensional image with respect to its scene type, selecting a deformation assigned to the defined scene type with which the two-dimensional image is deformed, deforming the two-dimensional image and ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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